/// 系统统一事件类型标识（用于 TLV header、ZMQ topic、消息解包路由）
#[repr(u16)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum EventType {
    Quote = 1,
    MarkSnapshot = 2,
    Order = 3,
    Trade = 4,
    Position = 5,
    Account = 6,
    // ... 更多类型自行扩展
    Unknown = 9999,
}
